5. Prestressed concrete beam design unshored-uniform load
Program will analyse a simple span uniformly loaded prestressed beam of either rectangular, single T, double T or box shape. Design will include structural or non-structural topping. Beam is examined at 20 points, cable placement envelope is determined, harping may be none, single or double points under control of the designer. Design is performed both elasti- cally to control tensile and compres sion stresses and by ultimate methods for both shear and moment. Stirrup number and spacings are determined. Mild steel is included when needed to satisfy ultimate characteristics. Creep may be included. All stresses may be varied including cable stresses at the designer's option. Deflections, end rotations and moments are included.
8. Waffle slab with support on four forces in the structure. The effects of
sides
Purpose is to calculate moments and required reinforcing steel in waffle slabs with one or two way action according to ACI 318-63, section A2003, method 3. Output includes moment coefficients and actual and allowable joist shear. A check is made of the compressive joist stress. 9. Waffle slab - continuous
This program determines moments and reinforcing steel for waffle slabs in accordance with the requirements of ACI 318-63 for flat slabs and ultimate strength design. Moments are found by 2 cycle moment distribution with spotting of live loads where required by the code. Program has a capacity for ten spans with cantilevers on either end.
slenderness and variable base restraint are included in the analysis. Output: Some or all input data, verti- cal loads, horizontal loads, moments and shears in the structure, deflections and rotations of the structure: and equilibrium check on the solution.
13. Floor systems supported by central core and exterior columns
The program determines the in- ternal moments and edge reactions induced by a uniform load on an L-shaped slab whose inner edge is supported by a continuous wall and whose outer edge is supported by columns.
The stiffness of the walls, columns and the slab, and the spacing of columns are variables. The outer edge of the slab between columns can be made either restrained or unrestrained
6. Post-tensioned slab and beam analy- 10. Flat slab with and without drop by the spandrel beam. sis and design
Program will analyse up to ten con- tinuous spans plus cantilevers with or without columns above and below. Members may have a variety of shapes. Loading may include uniform superim- posed dead load, uniform live load and up to six concentrated dead and live loads (No skip loading).
Provision is made for grouted or ungrouted strands specifying force and/or maximum cable locations. Elas- tic or ultimate strength moment calcu- lations are made. Method of analysis uses Lin's balanced-load method, using slope deflection equations solved by iteration. Shear design is elastic only. Various construction alternatives may be specified as well. Results are given for both initial and final conditions at 10 points across the spans, including stresses and eccentricities.
7. Prestressed concrete shear calculations
This program calculates required shear reinforcement in prestressed con- crete girders in accordance with Australian Standard CA35-1963, based on research at University of Illinois. Calculations are done at six points along the beams, which can either be tenth points for half span, or six arbi- trary points. Input consists of DL & LL moments and shears, section pro- perties, F'C, prestressing force, angle of prestresses, eccentricities. Output consists of working and ultimate shears, V'CT, V'CN cracking moment, steel area per ft.
30
panel
Program performs ultimate streng- th design of a flat slab by the empirical method of ACI 318-63. The program is a modification of the New York State flat slab program. Options in- clude slab with or without drop panels, input or calculated capital dimension and slab thickness, interior panel, exterior panel, or both. Program reads five input cards containing the batch parameters followed by any number of individual design cards, one per problem. Output includes slab and drop thickness, the area of reinforce ment required, and the panel load.
11. Two-way slab
This program calculates moments, required area of reinforcing steel and slab reactions on supporting beams for two-way slabs. Slab moments and reac- tions are found by method 28 ACI 318-63. Reinforcing steel is determin- ed by ultimate strength design in accordance with ACI 318-63.
12. Lateral load analysis of multi- storey frames with shear walls Capacity: Nine bays by 50 storeys could be extended to nine bays by 109 storeys or to 14 bays by 74 storeys - This program will analyse frames with or without shear walls subjected to lateral loads.
Method: While incorporating beam shear acting at the face of vertical members, slope deflection is used to 1orm a set of simultaneous equa- tions. The solution is used to find
14. Seismic analysis
Calculating of seismic lateral forces on each floor and overturning moment.
15. Seismic forces
Centre of rigidity, gravity and eccentricity are computed for one or multi-storey buildings. Lateral forces are printed due to direct and torsional effect.
16. Multi-storey earthquake rotation analysis - shear wall or frame method
Program will determine all shears and overturning moments for each of up to 20 walls each way on 10 storeys according to Los Angeles City Code and the Struct. Engrs. Assoc. of Calif. Works from dimensional description of walls and weights of elements of build- ing. Wall rigidities may be built up from subwall pier descriptions with designer controlling method of com- bining.
Program determines period, and takes account of torsion increases of shear, minimum or otherwise, may be used on larger buildings on an alter- nate story basis. Also useful in regular frame buildings to determine frame loads by modeling frames as walls.
17. Column working stress
This program designs symmetri- cally reinforced rectangular tied columns with (a) axial load only, (b) axial load and bending in one direction or (c) axial load and bending in two
Far East BUILDER, February 1971