IS 9716:1981 is the Indian Standard (BIS) for guide for lateral dynamic load test on piles. This standard provides guidance for conducting lateral dynamic load tests on piles to determine their load-deflection characteristics. It details the required apparatus, testing procedure, data collection, and methods for analyzing results to assess lateral pile capacity and stiffness.
Guide for lateral dynamic load test on piles
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Loading Method | Steady-state forced vibration using a mechanical oscillator with eccentric rotating masses. | Single, short-duration force pulse from accelerating a reaction mass (e.g., by combustion). | EN ISO 22477-10:2017 |
| Primary Measurement for Interpretation | Vibration amplitude at various oscillator frequencies to plot a resonance curve. | Time histories of force and displacement/acceleration. | EN ISO 22477-10:2017 |
| Force Measurement | Calculated from oscillator mass, eccentricity, and rotational frequency (m⋅r⋅ω²). | Measured directly with a calibrated load cell placed between the actuator and the pile. | ASTM D7383-19 |
| Displacement Measurement | Mechanical or electrical vibrographs to record amplitude. | Remote optical or laser-based systems measuring a target on the pile; may be supplemented by integrated accelerometer data. | EN ISO 22477-10:2017 |
| Derivation of Static Behavior | Lateral stiffness (k) is derived from the measured natural frequency of the pile-soil system. | Inertial and damping forces are subtracted from the measured force to derive an equivalent static load-deflection curve. | ASTM D7383-19 |
| Test Reference System | No specific requirement for a reference beam; measurements are absolute vibrations. | Requires an independent reference system for displacement sensors, located outside the zone of influence. | EN ISO 22477-10:2017 |